Cylinder cooling means



Sept. 23, 1947; J ZULJ'WECH 2,427,759

CYLINDER COOLING MEANS f" F. l

Inventor Ji-le/ Z 1/1. J/ I/ECH,

Sept, 23, 1947. J. ZULJIVECH CYLINDER COOLING. MEANS 2 Shets-Shqet 2Filed July 29, 1944 I n z'entor a M m Patented Sept. 23, 1947 UNITEDSTATES (PATENT OFFICE My invention relates to improvements in means forcooling the cylinders of internal com- :hustion engines.

.The primary obiectof my invention is to facih itate .the transfer .ofheat from the cylinders of internal combustion engines of the liquidcooled type, while .at the same time decreasing the weight .of thecylinders, strengthening the same and reducing to a minimum obstructionof the flow of the cooling medium, all without materially increasingmanufacturing or replacement costs.

Other and subordinate objects are also comprehended by my invention, allof which, together with the precise nature of my improvements, will bereadily understood when the succeeding description and claims are readwith reference to the drawings accompanying and forming part of thisspecification.

In said drawings:

Figure 1 is a view in vertical section of a cylinder equipped accordingto my invention, in the preferred embodiment thereof,

Figure 2 is a fragmentary view in tranverse section taken on the line 22of Figure 1,

Figure 3 is a view in horizontal section taken on the line 3-3 of Figure1 and drawn to an enlarged scale,

Figure 4 is a View in horizontal section of a modified embodiment of myinvention, and

Figure 5 is a view in vertical section of another modified embodiment.

Referring to the drawings by numerals, and first to Figures 1 to 3,according to my invention, in the preferred embodiment thereof, a steelcylinder I of an internal combustion engine, of the water cooled type,and including the usual liquid cooling jacket 2, base attaching flange3, and hollow head i is provided with vertical, circumferentially spacedfins 5 tapering in cross section from the cylinder and formed integrallywith the cylinder wall proper. The fins 5 are preferably spaced at thelower ends thereof from the bottom of the cooling jacket 2, extend tothe bottom of the head 4, and are spaced from the inner wall of saidjacket.

The fins 5 are capped by a sleeve-like easing 6 of metal having a highercoeflicient of conductivity as regards the transfer of heat than thefins 5, said casing having hollow fins 7 of the same shape as the fins 5fitting over said fins 5 and likewise spaced from the inner wall of theliquid cooling jacket 2. The casing 5 is preferably formed of aluminumand is shrunk on the fins 5 into intimate flush engagement therewiththroughout the length of the same.

The cylinder head 4, as shown, comprises a main spider plate 8 forclosing the upper end of the cylinder I, having the usual raised center9 provided with the socket H] for receiving the 3 Claims. (Cl. 123-173)spark plug I l, and a well 12 around said plug, a ring-section 13forming an extension of the liquid cooling jacket 2 connected to said'spider t "by integral, circumferentially spaced, radial apertured earsM, and an upper, annular cap plate i=5 provided with internalcirctunferentially spaced lugs N5. Bolts ll extending through. the cap:plate 15, lugs i6 and ears I a and also through internal lugs 13 in theupper end of the liquid cooling jacket '2, secure the described headparts together and to said jacket 2.

The spider 8 of the head 4 is provided with parallel fins -.l 9, similarto fins 5, extending across the top thereof and formed integrallytherewith and, preferably, when the head is not of the aluminum type,said fins 5 are capped by an annulus of hollow fins 20 similar to thefins 7 fitting around the cen ter 9 and shrunk on said fins I9.

In the modified embodiment of my invention shown in Figure 4, a tubularsleeve 2| having longitudinally extending solid fins 22 formedtherewith, and which is of the same material as the casing 6, with thefins 22 similar to the fins I, is provided on the cylinder 23 within theliquid cooling jacket 2 said fins 23, as shown, being solid.

As shown in Figure 5, the cylinder 25 of an airplane liquid cooledengine may be provided with longitudinal fins 26 similar to fins 22 andpreferably integral with the cylinder 25. The head 21 may be providedwith circular internal fins 28 around the intake and exhaust valves 29,30 and with internal fins 3| between said valves, all cast with thehead.

As will now be seen, my invention comprises providing the cylinders ofinternal combustion liquid cooled engines with a maximum heat transfersurface of ribbed form in which the ribs are arranged to extend in thedirection of the flow of the cooling medium, thereby obviating, as faras possible, resistance to flow of the cooling medium. The coolingsurface is provided on the cylinder wall proper, where the reatest heatis generated, as distinguished from the cooling jacket, therebyfacilitating cooling the engine, as will be clear. Since the finsstrengthen the same, the walls of the cylinder, and also the head, maybe cast lighter than can now be accomplished, without sacrificingstrength. With cast steel cylinders and head, and even with aluminumheads, my improved arrangement of cooling means will effect transfer ofa greater amount of heat than has heretofore been possible and suchtransfer will be accelerated as compared with the rate of transfer inpresent day engines.

The foregoing will, it is believed, sufiice to impart a clearunderstanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modificationwithout departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the appendedclaims.

What I claim is:

1. The combination with an internal combustion engine cylinder, and ajacket surrounding the cylinder for containing a cooling liquid, ofcooling fins radiating from the cylinder in circumferentiallyspaced-apart relation and extending lengthwise of said cylinder withouter edges spaced from said jacket, said cylinder having a hollow headclosing the same and forming a part of said jacket and provided withinternal horizontal fins.

2. The combination with an internal combustion engine cylinder, and ajacket surrounding the cylinder for containing a cooling liquid, ofcooling fins radiating from the cylinder in circumferentiallyspaced-apart relation and extending lengthwise of said cylinder withouter edges spaced from said jacket, said cylinder having a hollow headforming a part of said jacket and provided with internal horizontalfins, said fins tapering in cross section outwardly.

3. The combination with an internal combustion engine cylinder, and ajacket surrounding the cylinder for containing a cooling liquid, of

cooling fins radiating from the cylinder in circumferentiallyspaced-apart relation and extending lengthwise of said cylinder withouter edges spaced from said jacket, and a casing comprising hollow finsfitting around said cylinder and over said cooling fins and formed of a,metal having a higher coefi'icient of conductivity in the transfer ofheat than the fins first mentioned.

JERI ZULJIVECH- REFERENCES CITED The following references are of recordin the file of this patent:

UNITED STATES PATENTS

